Ouch, who tuned it?

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Edit: won't name the tuner as I don't want the wrong impression given. I believe the tune was safe but by my altering the cat it caused the engine to excessively lean out.

If you had a set of forged Pistons in would this still have happened or would it just move on the next weakest link in the chain. Bummer about your engine mate hope it works out not to bad..

Mark

Not qualified enough to say mate, they are factory forged of course but who's to say whether aftermarket pistons would have avoided this.

At the end of the day 'shit happens' and I made an assumption that backfired on me. Lesson learnt. I booked some time off work so am pulling the engine this week and taking it to Doug, and fingers crossed I'll have it back and running before Xmas.
And yes if ppl want to know the tuner they can see my bug thread but my main point is that I don't believe the piston failed purely as a result of the tune.

Moral of the story is if you make even a small change to your exhaust ie gutting cat or going high flow cat and you are running a tune... Go get a retune.

When I replaced my failed butler down pipe due to collapsed cat, it leaned by 0.3 afr (11.5 to 11.8), got it retuned asap.

I think fatigue is the reason why most old sti has piston failure, any knock would make this procesa lot faster.

Maybe get a afr gauge while u wait for a rebuild? Good luck.

using the Perth-WRX mobile app

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport

Which wideband O2 set up are you running in your car??

Here's some pics of a 1999-2000 EJ207 factory forged piston - after 270K+ KM :






That motor was pinged, boost spiked to 29psi, belted on skid pans, flogged at Collie & taken to 8500rpm regularly.......Not a single piston 'fatigue' failure.... In fact it would not die!

These motors actually had real forged pistons.

If any model is going to suffer metal fatigue in it's pistons it will be the EJ255/Ej257 hyper crap chocolate pistons......

EJ207's just love 12.4:1 Afr's on boost haha!

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

i must be real unlucky then

207 has forged pistons...

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No Subarus currently owned

Might want to edit out your bug thread if you want to hide the tuner..

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2015 Forester XT Premium
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teejay: If I wanted a comeback Id wank in front of a fan

What did you do to the cat?

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Huge range of extinguisher brackets for cars!

http://kap.industries/